Isoindolin-1-one derivatives

ABSTRACT

Isoindolin-1-one derivatives substituted on the nitrogen atom in the 2-position by an unsubstituted or substituted phenyl radical or a heterocyclic radical having aromatic characteristics, substituted in the 3-position by a 3-amino(or substituted amino)2-hydroxypropoxy group, and optionally substituted in the 5and/or 6-positions by one or two alkoxy radicals or optionally substituted in the 5- and 6-positions by a methylenedioxy radical, possess pharmacodynamic properties, and are especially useful as antiarrhythmic agents.

Cotrel et al.

ISOINDOLIN- 1 -ONE DERIVATIVES Inventors: Claude Cotrel, Choisy-le-Roi;

Claude Jeanmart, Brunoy; Mayer Naoum Messer, Bievres, all of France Assignee: Rhone-Poulenc, S.A., Paris, France Filed: Mar. 14, 1973 App]. No.: 341,307

Foreign Application Priority Data Mar. 16, 1972 France 72.009207 Feb. 2, 1973 France 73.003728 U.S. Cl.260/268 BC; 260/247.2 A; 260/250 R;

260/250 A; 260/250 B; 260/250 Q; 260/251 R; 260/325 PH; 260/293.6l; 260/296 B, 424/248; 424/250; 424/267; 424/274 Int. Cl C07d 27/50 Field of Search... 260/325 PH. 247.2 A, 268 BC, 260/293.6l

[ Aug. 5, 1975 [56] References Cited UNITED STATES PATENTS 3,696.12l l0/l972 Troxler 260/326.l5

Primary E.\'aminerJoseph A. Narcavage Attorney, Agent, or Firm-Stevens, Davis, Miller & Mosher 5 7 ABSTRACT lsoindolin-l-one derivatives substituted on the nitrogen atom in the 2-position by an unsubstituted or substituted phenyl radical or a heterocyclic radical having aromatic characteristics, substituted in the 3-position by a 3-amino(or substituted amino)-2-hydroxypropoxy group, and optionally substituted in the 5- and/or 6- positions by one or two alkoxy radicals or optionally substituted in the 5- and 6-p0sitions by a methylenedioxy radical, possess pharmacodynamic properties, and are especially useful as antiarrhythmic agents.

12 Claims, No Drawings lSOINDOLIN-l-ONE DERIVATIVES This invention relates to new therapeutically useful isoindoline derivatives, processes for their preparation and pharmaceutical compositions containing them.

The new isoindoline derivatives of the present invcntion are those of the general formula:

N-Ar I [wherein Ar represent a phenyl radical or a heterocyclic radical having aromatic characteristics, for example pyridyl or pyridazinyl, optionally carrying one or two substituents, which in the latter case may be identical or different, selected from halogen (e.g. chlorine) atoms, alkyl radicals containing 1 to 4 carbon atoms (e.g. methyl), alkoxy radicals containing 1 to 4 carbon atoms (e.g. mcthoxy), cyano and nitro radicals and the trifluoromcthyl group, the symbols X and Y, which may have the same or different significanccs, each represent a hydrogen atom or an alkoxy radical containing 1 to 4 carbon atoms (preferably mcthoxy), or X and Y together form a methylenedioxy radical, and the symbols R, and R which may have the same or different significances, each represent a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms, or R, and R together with the nitrogen atom tov alkyl radical containing 1 to 4 carbon atoms (prefera-- bly methyl)], and acid addition salts thereof. It is to be understood that the aforementioned alkyl and alkoxy groups may have straight-or branched-carbon chains.

According to a feature of the invention, the isoindoline derivatives of general formula I are prepared by the process which comprises reacting an amine of the general formula:

(wherein R, and R are as hereinbefore defined) with an isoindoline derivative of the general formula:

-Ar III wherein Ar, X and Y are as hereinbefore defined. The reaction is generally carried out by heating the isoindoline derivative of general formula Ill with the amine of general formula ll at the boiling point of the reaction mixture or under pressure in an autoclave. The reaction can also be carried out by heating the reactants in an organic solvent, for example benzene or toluene.

The isoindoline derivatives of general formula III can be obtained by reacting epichlorohydrin with an alkali metal salt, optionally prepared in situ, of an isoindoline derivative of the general formula:

N-Ar

wherein Ar, X and Y are as hereinbefore defined. The reaction is generally carried out in an anhydrous organic solvent, for example dimethylformamide, at a temperature below C.

The compounds of general formula IV can be obtained by reducing a phthalimide of the general formula:

(wherein Ar; X and Y are as hereinbefore defined) by methods known per se for reducing one of the carbonyl groups of phthalimide to a Cl-lOl-l group. The reduction is generally carried out by means of magnesium in a mixture of methanol and a saturated solution of ammonium chloride or by means of an alkali metal borohydride in an aqueous or aqueous-alcoholic medium.

When the phthalimido radical is substituted asymmetrically, the partial reduction of a compound of general formula V can lead to isomeric products which can be separated by application of physico-chemical methods such as fractional crystallisation or chromatography.

The compounds of general formula V can be obtained by reacting'an amine of the general formula:

Ar Nl-l (wherein Ar is as hereinbefore defined) with an ophthalic acid anhydride of the general formula:

VII

(wherein R and R are as hereinbefore defined) with an alkali metal derivative, optionally prepared in situ,

of an isoindoline derivative of general formula IV, wherein Ar, X and Y are as hereinbefore defined. The reaction is generally carried out in an anhydrous organic solvent, for example dimethylformamide, at a temperature below 30C.

The epoxypropanes of general formula VIII can be obtained by reacting an amine of general formula II with epichlorohydrin. i

The isoindoline derivatives ofgeneral formula I obtained by the aforementioned processes canbe purified by physical methods such as distillation, crystallisation or chromatography, or by chemical methods such as formation of salts, crystallisation of the salts and decomposition of them in an alkaline medium. In carrying out the said chemical methods the nature of the anion of the salt is immaterial, the only requirement being that the salt must be well defined and readily crystallisable.

The isoindoline derivatives of general formula I may be converted by methods known per se into acid addition salts. The acid addition salts can be obtained by the action of acids on the new compounds in appropriate solvents. As organic'solvents there may be used alcohols, ketones, ethers, or chlorinated hydrocarbons. The salt which is formed, is precipitated, if necessary after concentration of the solution, and is isolated by filtration or decantation.

By the term methods known per se as used in this specification is meant methods heretofore used or described in the chemical literature.

I The isoindoline derivatives of the invention and their addition salts possess valuable pharmacodynamic properties; they are very active as antiarrhythmic agents. In vitro, at concentrations of between I and IO mg/Iitre, they have proved to be active in an investigation of the prolongation of the refractory period of auricles isolated from rabbits [G.S. Dawes Brit. J. Pharmacol., 1, 90 (1946)]. In vivo, they have proved to be active in rabbits against cardiographic anomalies caused by aconitine and in dogs against ventricular tachyarrhythmia caused by ouabain [B.R. Lucchesi et al, J. Pharmacol, 132, 372 1961) and Ann. N.Y. Acad. $0., 139, art. 3. 940 19.67)] at doses between 0.1 and 10 mg/kg animal body weight when administered intravenously.

Preferred isoindoline derivatives of the invention are those of general formula I wherein the symbol Ar represents a phenyl, pyridyl (e.g. pyrid-Z-yl) or pyridazinyl J (e.g. pyridazin-3-yl) radical optionally substituted by a halogen (preferably chlorine) atom, an alkyl or alkoxy radical containing 1 to 4 0 carbon atoms (preferably methyl or methoxy) or a trifluoromethyl group, X and Y both represent hydrogen atoms or both represent methoxy groups, R represents an alkyl radical containing l to 4 carbon atoms (preferably isopropyl or t.- butyl) and R5 represents a hydrogen atom, or the grouping -NR R represents a piperazinl yl radical optionally carrying in the 4-position an alkyl radical containing l to 4 carbon atoms (preferably methyl). Of outstanding importance are those compounds wherein Ar represents a phenyl radical, X and Y both represent hydrogen atoms, R represents'an alkyl radical containing 1 to 4 carbon atoms (preferably isopropyl or t.- butyl), and R represents a hydrogen atom, and especially 3-( 2-hydroxy-3 -isopropylamino-propoxy -2-phenyl-isoindolin l-one and 3-( 2-hydroxy-3-t.- butylamino-propoxy )-2-phenyl-isoindolin- 1 -one.

For therapeutic purposes, the isoindoline derivatives of general formula I may be employed as such or in the form of non-toxic acid addition salts, i.e. salts containing anions which are relatively innocuous to ,the animal organism in therapeutic doses of the salts (such as hydrochlorides, sulphates, nitrates, phosphates, acetates, propionates, succinates, benzoates, furnarates,-maleates, tartrates, theophyllinacetates, salicylates, phenolphthalinates I and methyIene-bis-B- hydroxynaphthoates) so that the beneficial physiological properties inherent in the bases are not vitiated by side effects ascribable to the anion.

The following non-limitative Examples illustrate the invention.

' EXAMPLE 1 A solution of 3-(2,3-epoxypropoxy -2- phenylisoindolin-l-one (19.7 g.) in isopropylamine (50 cc.) is heated under reflux for 26 hours. After cooling the reaction mixture, di-isopropyl ether (I00 cc.) is added and the product which crystallises is filtered off and then washed with di-isopropyl ether 50 cc.). After drying, a product (18.2 g.), melting at 98C., is obtained. On recrystallisation from acetonitrile cc.), 3-(2-hydroxy-3-isopropylamino-propoxy)-2- phenylisoindolin-l-one (14.1 g.), melting at 98C,, is obtained. v g l I 3-( 2,3-Epoxypropoxy 2-phenyl-isoindolin- 1 -one employed as a starting material can be prepared by adding a solution of 3-hydroxy-2-phenyl-isoindolinl-one (67.5 g.) in anhydrous dimethylformamide (180 cc.) to a suspension of sodium hydride (50% dispersion in mineral oil) (15.8 g.) in anhydrous dimethylformamide (250 cc.), whilst keeping the temperature at about 30C. When the evolution of gas has ceased, epichlorohydrin (55.5 g.) is added and the temperature is allowed to rise gradually to about 50C. The reaction mixture is stirred for a further 5 hours, whilst allowing it to return to a temperature of about 20C., and is then poured into water 1,500 cc.). The insoluble yellow oil is extracted 3 times with methylene chloride (total 800 cc.). The solution obtained is washed 5 times with water (total 1,250 cc.), dried over sodium sulphate and then concentrated to dryness under reduced pressure. A brown oil g.) is obtained and is dissolved in a mixture of methylene chloride and cyclohexane (1/1 by volume; 500 cc.). The solution obtained is filtered through silica gel (800 g.) contained in a column 6.5 cm. in diameter. Elution is then carried out with a mixture of methylene chloride and cyclohexane (1/1 by volume; 2,500 cc.) and then with a mixture of methylene chloride and cyclohexane (3/1 by volume; 1,000 cc.). These eluates are discarded Elution is then carried out with a mixture of methylene chloride and cyclohexane (3/1 by volume; 10,000 cc.) and then with pure methylene chloride (4,000 cc. These eluates are combined and concentrated to dryness under reduced pressure. The residue obtained is treated with diethyl ether 150 cc.) and the insoluble product is filtered off and then washed with diethyl ether (50 cc.). After drying, 3-( 2,3-epoxypropoxy )-2-phenyl-isoindolinl-one (44.4 g.), melting at 76C., is obtained.

3-Hydroxy-2-phenyl-isoindolin-l-one can be prepared according to the method described by A. Dunet and A. Willemart, Bull. Soc. Chim. p. 1,045 (1948).

EXAMPLE 2 A solution of 3-hydroxy-2-phenyl-isoindolin-l-one (6.75 g.) in anhydrous dimethylformamide cc.) is added to a suspension of sodium hydride (50% dispersion in mineral oil) 1.48 g.) in anhydrous dimethylformamide (20 cc.). When the evolution of gas has ceased. 2,3-epoxy-l-isopropylamino-propane (3.8 g.) is added whilst keeping the temperature at about 5C. After the end of the addition, stirring is continued for a further 24 hours at a temperature of about 20C. and then theh reaction mixture is poured into ice-water (250 cc.). The insoluble oily product is extracted with methylene chloride (3 X 100 cc.). The solution obtained is dried over sodium sulphateand then concentrated to dryness under reduced pressure. The oily residue is taken up in diethyl ether (50 cc.) and the insoluble product is filtered off and then washed with diethyl ether (30 cc.). The filtrate is then extracted with 0.5N hydrochloric acid (60 cc.). The acid solution obtained is washed with diethyl ether (20 cc.) and then rendered alkaline by the addition of 1N sodium hydroxide solution (30 cc.). The insoluble oily product is extracted with diethyl ether (2 X 50 cc.) and the solution obtained is dried over sodium sulphate and then concentrated to dryness under reduced pressureh The oily product obtained is dissolved in a mixture of diethyl ether and di-isopropyl ether (l/l by volume; 20 cc.), and the product which crystallises is filtered off and then washed with a mixture of diethyl ether and diisopropyl ether (1 /1 by volume; 5 cc.). After drying, 3-(2-hydroxy-3-isopropylamino-propoxy)-2-phenylisoindolin-l-one (1.35 g.). melting at 92C., is obtained.

2,3-Epoxy-l-isopropylamino-propane employed as a starting material can be prepared by slowly adding isopropylamine (34.8 g.) to a mixture of epichlorohydrin (55.6 g.) and water (2cc.), at a temperature of about 30C. The reaction mixture is stirred for a further 2 hours at a temperature of about 20C. and then a solution of sodium hydroxide (28 g.) in water (50 cc.) is added slowly, whilst maintaining this temperature. The

reaction mixture is stirred for a further hour at atemperature of about 20C. and is then poured into water (140 cc.). The insoluble oily product is extracted with diethyl ether (3 X 50 cc.). The solution obtained is washed with water (2 X 20 cc.), dried with potassium EXAMPLE 3 A solution of 2-( 4-chlorophenyl )-3-( 2,3- epoxypropoxy)-isoindolin-l-one (15 g.) and isopropylamine cc.) in anhydrous toluene (250 cc.) is heated under reflux for 5 days. The reaction mixture is then evaporated to dryness under reduced pressure and the residue obtained is recrystallised from ethyl acetate (60 cc.). After drying, 2-(4-chlorophenyl)-3-(2- hydroxy-3-isopropylamino-propoxy )-isoindolin- 1 -one (13 g.), melting at 107C., is obtained.

2-(4-Chlorophenyl)-3-(2,3-epoxypr0poxy)- isoindolin-l-one employed as a starting material can be prepared by adding a solution of 2-(4-chlorophenyl)-3- hydroxy-isoindolin-l-one (24 g.) in anhydrous dimethylformamide (180 cc.) to a suspension of sodium hydride (50% dispersion in mineral oil) (4.85 g.) in anhydrous dimethylformamide cc.). When the evolution of gas has ceased, epichlorohydrin (25.5 g.) is added and the mixture is stirred for 20 hours at a temperature of about 20C. The reaction mixture is then poured into ice-water (1,750 cc.) and the oily product which separates out is extracted with methylene chloride (4 X 200 cc.). The solution obtained is dried over sodium sulphate and then evaporated to dryness under reduced pressure. The oil thus obtained is dissolved in isopropanol (35 cc.). The product which crystallises is filtered off and then washed with isopropanol (14 cc.) and di-isopropyl ether (50 cc.). After drying 2-(4- chlorophenyl )-3-( 2,3-epoxypropoxy )-isoindolin- 1 -one (17.4 g.), melting at 90 92C., is obtained.

2-(4-Chlorophenyl)-3-hydroxy-isoindolin-l-one can be prepared by adding a saturated aqueous solution of ammonium chloride (150 cc.) to a suspension of 2-(4- chlorophenyl)phthalimide (25.75 g.) and magnesium turnings (8.8 g.) in methanol 1,000 cc. After heating the reaction mixture under reflux for 2 hours and then stirring at 20C. for 20 hours, it is again heated to the boiling point, decolourizing charcoal (10 g.) is then added and the mixture is filtered whilst hot. After evaporating the methanol under reduced pressure, water (500 cc.) is added to the residue. A product crystallises and is filtered off and washed with water (200 cc.). After drying, a product (21.8 g.), melting at 200C., is obtained. On recrystallisation from ethanol (350 cc.), 2-(4-chlorophenyl)-3-hydroxyisoindolin- 1 -one 14.6 g.), melting at 200C., is obtained.

2-(4-Chlorophenyl)-phthalimide can be prepared according to the method described by G. Pagani et al, 11 Farmaco, Ed. Sci., 23, [b], 448 (1968).

EXAMPLE 4 A solution of 2-( 3-chlorophenyl)-3-( 2,3- epoxypropoxy)-isoindolin-l-one 12 g.) and isopropylamine cc.) in anhydrous toluene (200 cc.) is heated under reflux for 5 days. The reaction mixture is then evaporated to dryness under reduced pressure and the residue obtained is recrystallised from ethyl acetate (65 cc.). After drying, 2-(3-chlorophenyl)3-( 2- hydroxy-3-isopropylamino-propoxy )-isoindolin- 1 -one (1 1.6 g.), melting at 128C, is obtained.

2-( 3-Chlorophenyl )-3-( 2,3-epoxypropoxy isoindolin-l-one employed as a starting material can be 7 prepared by adding a solution of 2-(3-chlorophenyl)-3- hydroxy-isoindolin-l-one (19.5 g.) in anhydrous dimethylformamide (125 cc.) to a suspension of sodium hydride (50% dispersion in mineral oil) (3.96 g.) in anhydrous dimethylformamide 150 cc.). When the evolution' of gas has ceased, epichlorohydrin (21 g.) is added and the mixture is stirred for 20 hours at a temperature of about 20C. The reaction mixture is then poured into ice-water 1,500 cc.) and the oily product which separates out is extracted with methylene chloride (3 X 400 cc.). The solution obtained is dried over sodium sulphate and then evaporated to dryness under reduced pressure. The oil thus obtained is taken up in isopropanol (40 cc.). The product which crystallises is filtered off and then washed with isopropanol (10 cc.) and di-isopropyl ether (40 cc.). After drying, 2-(3- chlorophenyl)-3-(2,3-epoxypropoxy)-isoindolin-l-one (12.4 g.), melting at 123l25C., is obtained.

2-( 3-Chlorophenyl )-3-hydroxy-isoindolin- 1 -one can be prepared by adding a saturated aqueous solution of ammonium chloride 150 cc.) to a suspension of 2-( 3- chlorophenyl)phthalimide (25.75 g.) and magnesium turnings (8.8 g.) in methanol 1,000 cc.). After heating under reflux for 2 hours followed by stirring at 20C. for 20 hours, decolourizing charcoal (10 g.) is added, the mixture is filtered and the methanol is then distilled under reduced pressure. Water (500 cc.) is then added to the residue. The product which crystallises is filtered off and then washed with water (200 cc.). After drying, a product 18.9 g.), melting at 170C., is obtained. On recrystallisation from ethanol (200 cc.), 2-(3- chlorophenyl)-3-hydroxyisoindolin-l-one 1 1.5 g.), melting at 172C, is obtained.

- 2-(3-Chlorophenyl)phthalimide can be prepared according to the method described by G. Pagani et a1, 11 Farmaco, Ed. Sci., 23, [5], 448 (1968).

EXAMPLE 5 Following the procedure of Example 3 but starting with 3-(2,3-epoxypropoxy)-2-(3-methoxyphenyl)isoindolin-l-one (28.5 g.) and isopropylamine (142 cc.), 3- (2-hydroxy-3-isopropylamino-propoxy)-2-(3- methoxyphcnyl)isoindolin-l-one (15.7 g.), melting at l C., is obtained after recrystallisation from ethyl acetate.

3-( 2,3-Epoxypropoxy )-2-( 3-methoxyphenyl )isoindolin-l-one, in the form of a yellow oil, can be prepared following the procedure described in Example 1 for the preparation of the similar starting material from 3- hydroxy-2-(3-methoxyphenyl)-isoindolin-1-one (20.8 g.), sodium hydride (50% dispersion in mineral oil) (4.3 g.) and epichlorohydrin (22.6 g.).

3-l-lydroxy-2-(3-methoxyphenyl)isoindolin-1-one can be prepared according to the method described in the specification of Belgian Pat. No. 776,682, granted to Rhone-Poulenc SA. on an application filed Dec. 14,

EXAMPLE 6 A mixture of 3-(2,3-epoxypropoxy)-2- phcnylisoindolin-lone (2.8 g.) and t.-butylamine (8.4 cc.) is heated in an autoclave at 100C. for 20 hours. (85 cc.) and the insoluble product is extracted with methylene chloride (75 cc.). The organic solution is washed with water (2 X 25 cc.) and then with 0.3N hydrochloric acid (2 X 30 cc.). The acid solution obtained is rendered alkaline by addition of 1N sodium hydroxide solution (20 cc.). The insoluble oily product is extracted with methylene chloride (2 X 35 cc.), and then the organic solution obtained is dried over sodium sulphate and concentrated to dryness under reduced pressure. After two successive recrystallisations of the resulting residue from acetone, 3-( 2-hydroxy-3-t.- butylaminopropoxy )-2-phenyl-isoindolin- 1 -one l .6 g.), melting at 130C., is obtained.

EXAMPLE 7 Following the procedure of Example 3 but starting with I 3-( 2,3-epoxypropoxy )-2-( 3- trifluoromethylphenyl)-isoindolin-l-one (7.5 g.) and isopropylamine (3 7 .5 cc. 3-( 2-hydroxy- 3- isopropylamino-propoxy )-2-( 3- trifluoromethylphenyl)-isoindolinl-one (5.8 g.), melting at 125C., is obtained after recrystallisation from acetonitrile.

3-( 2 ,3-Epoxypropoxy )-2-( 3-trifluoromethylphenyl)- isoindolin- 1 -one, in the form of a yellow oil, can be prepared following the procedure described in Example 1 for the preparation of the similar starting material from 3-hydroxy-2-( 3-trifluoromethylphenyl )isoindolinl-one (16 g.), sodium hydride (50% dispersion in mineral oil (2.88 g.) and epichlorohydrin (15 g.).

3Hydroxy-2-( 3-triflu0romethylphenyl )-is0indolinl-one can be prepared by adding a solution of potassium borohydride (11.3 g.) in water (93 cc.) and 1N sodium hydroxide solution (11.3 cc.) to 'a suspension on N-(3-trifluoromethylphenyl)-phthalimide (80.9 g.) in methanol (380 cc.), whilst keeping the temperature at about 20C. The reation mixture is then stirred for 18 hours at a temperature of about 20C. The insoluble product is filtered off and then washed with ethanol (50 cc.) and petroleum ether (100 cc.). After drying, 3- hydroxy-2-( 3-trifluoromethylphenyl)-isoindolin- 1 -one (63.9 g.), melting at 202C., is obtained.

N-(3-Trifluoromethylphenyl)-phtha1imide can be prepared according to the method described by G. Pagani et al, 11 Farmaco, Ed. Sci. 23 [5], 448 (1968).

EXAMPLE 8 A solution of 3-( 2,3-epoxypropoxy )-2- phenylisoindolin-l-one (8.4 g.) and l-methylpiperazine (3.6 g.) in anhydrous toluene (84 cc.) is heated under reflux for 3 days. After cooling, the reaction mixture is washed with water (2 X 50 cc.) and then the organic solution is extracted with 1N hydrochloric acid (55 cc.) and water (3 X 20 cc.). The aqueous and acid solutions are combined and are rendered alkaline by addition of 1N sodium hydroxide solution (55 cc.). The oil which separates out is extracted with methylene chloride cc.) and then the organic solution obtained is dried over sodium sulphate and concentrated to dryness under reduced pressure. Theresidual oil is dissolved in ethanol (20 cc.) and the resulting solution is added to a hot solution of fumaric acid (5.85 g.) in ethanol (80 cc.). The product which crystallises on cooling is filtered off and then washed with ethanol (30 cc.) and di-isopropyl ether (40 cc.). After drying, 3-[2- hydroxy-3(4-methylpiperazinl -yl )-propoxy]-2- phenyl-isoindolin-l-one acid difumarate 14.5 g.), melting at 194C, is obtained.

EXAMPLE 9 A solution of 2-( 5-chloropyrid-2-yl )-3-( 2,3- epoxypropo xy)-isoindolin-l-one (11.4 g.) in isopropylamine (57 cc.) is heated under reflux for 26 hours. After cooling, the reaction mixture is concentrated to dryness under reduced pressure. On recrystallisation of the resulting residue from ethyl acetate (20 cc.). 2-(5-chloropyrid-2-yl)-3-(2-hydroxy-3- isopropylamino-propoxy)-isoindolin-l-one (10.6 g.), melting at 107C., is obtained.

2-(5-Chloropyrid-2-yl)-3-(2,3-epoxypropoxy)isoindolin-l-one, melting at 123C., can be-prepared from 2-(5-chloropyrid-2-yl)-3-hydroxy-isoindolin-l-one (20.8 g.), sodium hydride (50% dispersion in'min'er'al oil) (4.2 g.) and epichlorohydrin (14.8 g.).

2-( -Chloropyrid-2-yl )-3-hydroxy-isoindolin- 1 -one can be prepared according to the method described in the specification of Belgian Patent No. 771.493 granted to Rhone-Poulenc SA. on an application filed Aug. 14.1971.

EXAMPLE A solution of 3-( 2 ,3-epoxypropoxy )-2-( 6- methylpyridazin-3-yl)-isoindolin-l-one 17.4 g.) in iso propylamine (87 cc.) is heated under reflux for 26 hours. The reaction mixture is then concentrated to dryness under reduced pressure. The residual oil is dissolved in ethyl acetate (400 cc.) and the solution obtained is filtered through silica gel (400 g.) contained in a column 4 cm. in diameter. Elution is then carried out successively with pure ethyl acetate (1,200 cc.), a mixture of ethyl acetate and methanol (95/5 by by volume; 3,200 cc.), a mixture of ethyl acetate and methanol (90/10 by volume; 1,600 cc.) and a mixture of ethyl acetate and methanol (80/20 by volume; 1,200 cc.). All these eluates are discarded. Elution is then carried out with a mixture of ethyl acetate and methanol (80/20 by volume; 2,800 cc.) and then with a mixture of ethyl acetate and methanol (50/50 by volume; 1,600 cc.). After concentrating these eluates to dryness and recrystallising the residue from a mixture of diisopropyl ether and acetonitrile (85/15 by volume), 3-(2- hydroxy-3-isopropylamino-propoxy)-2-(6- methylpyridazin-3-yl)-isoindolin- 1-or1e (4g.), melting at 90C., is obtained.

3-(2,3-Epoxypropoxy)-2-(6-methylpyridazin-3-yl)- isoindolin- 1 -one, melting at 1 10C., can be prepared by the procedure described in Example 3 for the preparation of the similar starting material from 3-hydroxy-2- (6-methylpyridazin-3-yl)-isoindolin-l-one (18 g.), sodium hydride (50% dispersion in mineral oil) (3.95 g.) and epichlorohydrin (21 g.).

2-(6-Methylpyridazin-3-yl)-3-hydroxyiosoindolin- I l-one can be prepared by adding a solution of potassium borohydride (3.64 g.) in water (29 cc.) and 1N sodium hydroxide solution (3.8 cc.) to a suspension of 3-methy1-6-phthalimido-pyridazine (21 g.) in methanol (105 cc.), whilst stirring and keeping the temperature at about C. After 2 hours at C., the insoluble product is filtererd off and then washed with methanol (60 cc.). After drying, 2-(6-methylpyridazin-3-yl)-3- hydroxy-isoindolin-l-one (18.4 g.), melting at 232C, is obtained.

3Methyl-ophthalimido-pyridazine can be prepared by heating a mixture of phthalic anhydride (14.8 g.) and 3-amino-6-methyl-pyridazine 10.9 g.) in diphenyl ether (74 cc. for 20 minutes at a temperature of about 190C. The reaction mixture is then allowed to return to 45C. and di-isopropyl ether cc.) is added. The product which crystallises is filtered off and then washed with di-isopropyl ether (30 cc.). After drying, 3-methyl-6-phthalimido-pyridazine (21.5 g.), melting at 214C., is obtained.

3-Amino-6-methyl-pyridazine can be prepared, according to the method described by W.G. Overend and L. F. Wiggins, J. Chem. Soc., p. 239 (1947).

EXAMPLE. 11

propoxy )-5 ,6-dimethoxy-2-phenyl-isoindolin- 1 -one (3 y g.), melting at C., is obtained.'

3-(2,3-Epoxypropoxy)-5,6-dimethoxy-2- phenylisoindolin-l-one, melting at 142C., can be prepared by the procedure described in Example 4 for the preparation of the similar starting material from 3- hydroxy-S,6-dimethoxy-2-phenyl-isoindolin-l-one (4.5 g.), sodium hydride -(50% dispersion in mineral oil) (0.85 g.) and epichlorohydrin (4.4 g.).

3-Hydroxy-5 ,6-dimethoxy-2-phenyl-isoindolin 1 -one, melting at 205C, can be prepared as described in Example 3 for the preparation of 2-(4-chlorophenyl)3- hydroxy-isoindolin-l-one, but starting with 4,5- dimethoxy-2-phenyl-phthalimide (5.7 g.) and magnesium turnings (1.8 g.) in a mixture of methanol and a saturated solution of ammonium chloride.

4,5-Dimethoxy-2-phenyl-phthalimide can be prepared by heating a solution of 4,5-dimethoxyphthalic anhydride (15 g.) and aniline (6.7 g.) In acetic'acid cc.), under reflux for one hour. The product which crystallises on cooling is filtered off and then washed with di-isopropyl ether (50 cc.). After drying 4,5-dimethoxy-2-phenyl-phthalimide 18.8 g.), melting at 245C, is obtained.

4,5-Dimethoxy-phthalic anhydride can be prepared according to the method described by G. A. Edwards et al, J. Chem. Soc., (1925).

The present invention includes within its scope pharmaccutical compositions comprising, as active ingredient, at least one isoindoline derivative of general formula l, or a non-toxic acid addition salt thereof, in association with a pharmaceutical carrier or coating. The invention includes especially such preparations made up for oral, parenteral or rectal administration.

Solid compositions for oral administration include tablets, pills, powders and granules. In such solid compositions the active compound is admixed with at least one inert diluent such as sucrose, lactose or starch. The compositions may also comprise, as is normal practice, additional substances other than inert diluents, e.g. lubricating agents, such as magnesium stearate. Liquid compositions for oral administration include pharmaceutically-acceptable emulsions, solutions, suspensions, syrups and elixirs containing inert diluents commonly used in the art, such as water or liquid paraffin. Besides inert diluents such compositions may also comprise adjuvants, such as wetting, emulsifying and suspending agents, and sweetening, flavouring and aromatizing agents. The compositions according to the invention, for oral administration, also include capsules of absorbable material such as gelatin containing the active substance with or without the addition of diluents or excipients.

Preparations according to the invention for parenteral administration include sterile aqueous or nonaqueous solutions, suspensions or emulsions. Examples of non-aqueous solvents or vehicles are propylene glycol, polyethylene glycol, vegetable oils such as olive oil, and injectable organic esters such as ethyl oleate. These compositions may also contain adjuvants such as preserving, wetting, emulsifying and dispersing agents. They may be sterilized by, for example, filtration through a bacteria-retaining filter, by incorporation in the compositions of sterilizing agents, by irradiation, or by heating. They may also be manufactured in the form of sterile solid compositions, which can be dissolved in sterile water or some other sterile injectable medium immediately before use,

Compositions for rectaladministration are suppositories which contain, in addition to the active substance, excipients such as cacao butter or a suitable wax base.

The percentage of active ingredient in the compositions of the invention may be varied, it being necessary that it should constitute a proportion such that a suitable dosage shall be obtained. The dosage depends on the desired therapeutic effect, on the route of administration and on the duration of the treatment. In human therapy the compositions when administered orally to an adult should generally give doses between 50 mg. and 1000 mg. of active substance per day. In general the physician will decide the posology considered appropriate, taking into account the age and weight and other factors intrinsic to the patient being treated.

The following Example illustrate pharmaceutical compositions according to the invention.

EXAMPLE 12 Tablets containing 25 mg'. of active product 'and having the following composition are prepared in accordance with the usual technique:

3'( 2-hydroxy-3-isopropylamino-propoxy )2-phenylisoindolin-l-one 0.025 g. starch 0.100 g. precipitated silica 0.022 g. magnesium stearate 0.003 g.

We claim: 1. An isoindoline derivative of the formula:

wherein Ar is phenyl or phenyl carrying one or two substituents selected from halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms, cyario, nitro and trifluoromethyl, X and Y when taken singly represent hydrogen or alkoxy of 1 through 4 carbon atoms, or X and Y when taken together represent methylenedioxy, and R and R when taken singly represent hydrogen or alkyl of 1 through 4 4 carbon atoms, or R and R when taken together with the nitrogen atom to which they are attached represent piperidino, morpholino, piperazin-l-yl, or piperazin-l-yl carrying in the 4-position an alkyl radical of 1 through 4 carbon atoms, and non-toxic pharmaceutically acceptable acid addition salts thereof.

2. An isoindoline derivative according to claim 1 wherein the substituent or substituents on the phenyl radical represented by the symbol Ar is, or are, selected from chlorine, methyl, methoxy and trifluoromethyl, and non-toxic pharmaceutically acceptable acid addition salts thereof.

3. An isoindoline derivative according to claim 1 wherein Ar represents phenyl, X and Y represent hydrogen, R represents alkyl of 1 through 4 carbon atoms, and R represents hydrogen, and non-toxic pharmaceutically acceptable acid addition salts thereof.

4. An isoindoline derivative according to claim 1 wherein R represents isopropyl or t.-butyl and R represents hydrogen, or the grouping NR R- represents piperazin-l-yl or piperazin-l-yl carrying in the 4- position a methyl radical.

5. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)-2- phenyl-isoindolin-l-one and non-toxic pharmaceutically acceptable acid addition salts thereof.

6. The isoindoline derivative according to. claim 1 which is 3-(2-hydroxy-3-t.-butylamino-propoxy)-2- phenyl-isoindolin-l-one and non-toxic pharmaceutically acceptable acid addition salts thereof.

7. The isoindoline derivative according to claim 1 which is 2-(4-chlorophenyl)-3-(2-hydroxy-3- isopropylamino-propoxy)-isoindolin-l-one and nontoxic pharmaceutically acceptable acid addition salts thereof.

8. The isoindoline derivative according to claim 1 which is 2-( 3-chlorophenyl )-3-( 2-hydroxy-3 isopropylamino-propoxy )-isoindolin- 1 -one and nontoxic pharmaceutically acceptable acid addition salts thereof.

9. The isoindoline derivative according to claim 1 which is 3-(Z-hydroxy-3-isopropylamino-propoxy)-2- (3-methoxyphenyl)-isoindolin-l-one and non-toxic pharmaceutically acceptable acid addition salts thereof.

10. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)-2- (3-trifluoromethylphenyl)-isoindolin-l-one and nontoxic pharmaceutically acceptable acid addition salts thereof.

11. The isoindoline derivative according to claim 1 which is 3-[2--hydroxy-3(4-methylpiperazin-lyl )propoxy ]-2-phenyl-isoindolin- 1 -one and non-toxic pharmaceutically acceptable acid addition salts thereof.

12. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)5,6- dimethoxy-2-phenyl-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof. 

1. AN ISOINDOLINE DERIVATIVE OF THE FORMULA
 2. An isoindoline derivative according to claim 1 wherein the substituent or substituents on the phenyl radical represented by the symbol Ar is, or are, selected from chlorine, methyl, methoxy and trifluoromethyl, and non-toxic pharmaceutically acceptable acid addition salts thereof.
 3. An isoindoline derivative according to claim 1 wherein Ar represents phenyl, X and Y represent hydrogen, R1 represents alkyl of 1 through 4 carbon atoms, and R2 represents hydrogen, and non-toxic pharmaceutically acceptable acid addition salts thereof.
 4. An isoindoline derivative according to claim 1 wherein R1 represents isopropyl or t.-butyl and R2 represents hydrogen, or the grouping -NR1R2 represents piperazin-1-yl or piperazin-1-yl carrying in the 4-position a methyl radical.
 5. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)-2-phenyl-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof.
 6. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-t.-butylamino-propoxy)-2-phenyl-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof.
 7. The isoindoline derivative according to claim 1 which is 2-(4-chlorophenyl)-3-(2-hydroxy-3-isopropylamino-propoxy)-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof.
 8. The isoindoline derivative accoRding to claim 1 which is 2-(3-chlorophenyl)-3-(2-hydroxy-3-isopropylamino-propoxy)-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof.
 9. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)-2-(3-methoxyphenyl)-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof.
 10. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)-2-(3-trifluoromethylphenyl) -isoindolin-1-one and nontoxic pharmaceutically acceptable acid addition salts thereof.
 11. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3(4-methylpiperazin-1-yl)propoxy)-2-phenyl-isoindolin-1-one and non-toxic pharmaceutically acceptable acid addition salts thereof.
 12. The isoindoline derivative according to claim 1 which is 3-(2-hydroxy-3-isopropylamino-propoxy)5,6-dimethoxy-2-phenyl-isoindolin-1 -one and non-toxic pharmaceutically acceptable acid addition salts thereof. 